Stop mechanism



July 14,` 1931. w. A. DQISENBURY- 1,814,081

STOP MECHANISM Y Filed sept. 4, 1928` s sheets-sheet 1 l: l f

fn l l "lll, I Wl July 14, 1931. w.v A. DusENBURY 1,814,081

STOP MECHANISM Filed Sept. 4, 1928 3 Sheets-Sheet 2 July 14, 1931. w. Abusi-:NEURY 1,814,081

sToP MEcHANIsM Filed Sept. 4. 1928 5 Sheets-Sheet 3 fave/220% Patented July 14, 1931 wAm'En. ALLAN nus-insana@ or cnwAGo,-. Immers; 55mm-R3 1304x1160 -Emvmm warum @rcmese; Humors; A, eenronmmy or 1111.111015 This invention rltesto" impr'ovmts 113 therewith and is adapted to engage behind a flange or collar 32 which is secured to a reciprocable member 33, preferably in the form of a bar or rod that passes through and is supported by suitable bearings. One end of the member 33 is provided with an elongated slot 34 through which a rock shaft 35'passes, and carried by the end of the member 33 is a projection 36 preferably in the form of an anti-friction roller which is adapted to be engaged by a cam or projection 37 when the shaft 35 is rocked, so as to move the member 33 in one direction. A spring 38 is connected by one end as at 39 with the member 33 and'is anchored at its other end as at 40 to a fixed support. The

normal tendency of the spring 38 isv to move the member 33 toward the left in Figure 1. Connected with an arm or crank 37 a onthe shaftl 35 is a 'rod or link 41 which moves through a suitableguide or bearing 42 and is provided with an anti-friction roller 43 on one endthereof which engagesv and co-operates with a cam 44 connected with the shaft` 11, so that as kthe shaft 11 rotates the cam 37 and shaft 35 will be oscillated,vthereby causing thecam 37 to move into and out of engagement with the roller 36 on the membervr 33 to retract the member 33, for a slight distance, against the stress of the spring 38. As soonasthefcam 37 passes out of contact with the projection or roller` 36 the spring 38 will immediately shift the member 33 in the opposite direction, or to the left in Figure 1, so as to cause the shoulder or collar 32 to engage the dog 31 and thereby hold the member 33 retracted against the stress ofthe spring 38. Assoon as the dog 31 moves out of engagement with the cam or shoulder 32 l Y the spring 38 will move the member 33 under its stress, in a manner and for be later set forth.

Connected with the shaft 25 in any suitable manner is a counter-balance weight 45 so as to counter-balance the weight of the a purpose to i arm or projection 26 and the dog 31 and hold the latter in position to engage the collar or shoulder 32 when the member 33 is moved to the right in Figure 1. Y A rod or member 46 is mounted in suitl' able bearings to extend transversely of the machine preferably parallel with the shaft 11. This memberis provided with a collar 47 having a slot 48 therein. Pivotally mounted by one end as at 49 is an arm or lever 50 that'is arranged adjacent the side of the machine in proximity to the operating lever 24 which controls the clutch 23and connected to the arm or lever 50 as at 51 is one end of theA member or rod 46. One end of a spring 52 engages the collar or formation on the member 46 and the other end of the spring engages afixed support. This spring 52 tends normally to move the member 46 to the left in Figure 3 so as to cause the arm or lever 50 to engage the lever 24 and shift the latter in a direction to render the clutch 23 inactive and thereby stop the operation of the machine.

A lever 53 is pivotally mounted intermediate its ends as at 54 and one end 55 thereof is arrangedV in proximity to the collar or shoulder 47 on the member 46. This end of the lever 55 preferably is adaptedl to be seated within a recess 56 in a bracket 57, and with which recess the recess 48 in the collar or formation 47 is adapted to be brought into register, so that the end 55 of the lever 53 may be moved out of the recess 56 in the bracket 57 and into the recess 48 in the, collar 47' to lock the member 46 in a retracted position and against the stressof the spring 52, thereby causing the arm or lever 50 to be moved away from the controlling lever`24 so that the latter may be operated independently of the armVor lever 50 and thereby rendering it possible to control the starting and stopping of the machine by the operation of the lever 24 independently of the stop mechanism which 4constitutes the subject matter of ,this invention. l

The other end-of the lever 53 extends upwardly and terminates adjacent the member 33 and projects into a recess or housing. 58 carried by themember 33. spring 59 Vengages the end of the lever 53 and the other end of the spring is anchored as at 60, and the spring tendsnormally to move the lever53 in a direction to raise the end 55to cause the latter to enter the recess 48 in the collar 47 on the member 46 and thereby lock the member 46 retracted. When the member 33 is released bymoving the dog 31 out of engagement with the shoulder or collar 32 to allow the spring 38 to move the member 33 to the left in Figure 1, the spring 59 will be compressed and will cooperate with the member 33 to move the lever 53 about its pivot in a direction to move the end 55 of the lever out of the recess 48Vin the .1

collar 46to release the member 46. At this time the spring 52 will shift the member 46 to the leftv in Figure 3,1 therebyshifting the arm or lever 50 to cause the latter toV engage and shift the control lever 24 and thereby release` the clut-ch 23 and stop the operation of the machine.

This operation will take place when the envelopes are not being properly fed or delivered between the members 17 of the endless conveyor 18.

Referring to Figure 2. it will be apparent that asthe envelopes 16 are placed upon the conveyor 18, the extremity 29 of the finger or feeler 28 will engage and rest upon the top edge of the last envelope which has been delivered to the conveyor. When the envelopes. are thus properly fed the extremity 29 of the'finger or feeler will pass successively from one to the next adjacent envelope and' will mise the mageriindependently' of the amd, assuming that the member i's helsnil ret-rented against theV stresser the Spring 383I by theI engagement.' oi the dog mle f ws

' the vleftf ini U Iier i131 before statedniloi ieeler will 'rockiindependentlv' 'of the she-lt '251 Atfthie time the endf55' of the` leverr 5i?) 'wiki be seated: in. thefnotch or recess;y 1&8 in the coller 4i? lmnd' the member@ is held retracted inst the` Vstresseof the spring" 552; a Shnuht; for amy vreason,` the` e'nveiopes tu' bel delivered pro tween the members there will benothingftosupvport'the eeler or 281 aindit will drop with: reep'eetito the 25 untiir the 'pin 30 engages; thebottem ofthe elet 27' in the'asrrn or' projection.- 26. i'bheweght ef the finger er feeier 28wi111 thus be addedi to.v the` arm or' projection w'overeemethe emiixter-beineing weight 45 @the shwt 25, with theiresultthet the shaft .25""Willzfbe Ibcled end' the@rrr dog 31 will be v'rammed idefwrrw ar'ly, @di engagement' with the or' l1.1m! '32,l thereby releasing the member 33 4pemritting-.ift toi bev operated @om the stress ef the; spriirgfg. with the remit thet the liinber 33 will'.` be' 'shitedto Figure 1. This mevement et the member 33- Wil'lfroch the lever 53. im lthe malrrefleeee theme'mber t6 sothat the springe@ willl act the member 46 to shift the arm or lever 5@ i:15nd rochl or slufftithex coiitroi lever-24 tu shift* the` chsltclr 23- and step the operation fail ly'and sueeessirve'ly beiliyoi the machime.

'stopping' ef the kmchirleiA Whenthe* dog '31' is in ergngemenwith the collar' or shoulder 32,'semd' as the` member 33 isi liuexldv retracted asgaifn'stA the stress of the spring 3% by s'lieh eirggement, it will be manifest-that there: is eonsiderebie fric-:tion er 'bindingctinm `between `'1il-1e=cb1ler 32 y and vche dog. 31', which; iff' not' relievedrvvliienf the fingir' ori fee'ler VE@ drops, mightifnterfere withftlne operation df thea mechanism amid `the There'fore, in order to overcome this blinding' eiilect' between the! deg; and@ the coller oishonldei 32 the slaot 34 of thiexmember '33 is Each `tme'fther Aehafftf-I is oscilleted the membefri will be retrcted'ormoved `to l"che right in Figure 171 thereby overcmningfthis hineingection, sind-'if it were liot'iie'iV the actthat the eirtrelnfity'QQ'` of' the finger or feeler 28 ie held'smpparted the upper edge of the `enfvelaei'pein? the'` conveyor 181,.;and the counter-balaitciligi ofthe shaift 255 and deg 3l 'and Y armor projectionl 26, the deglvwoiild drop :und the member' 33 4 i te bero lrated upon* the? stress -ofi the s 'ng-B Bl'xt, asthe finger vor feeier '28 is held elevated such action cannot occur es the endoa the dog 311v`vill elweyslbemaiintained in the petlfifof' movementfef the'cllar or shoulder 32' until the extremity of the chimie interrupted; 17 oi the conveyorf18, Y

would be releasedthex conirter-balance of.l the dog'h f Thus it Will be rseen that When' envelopes f lare :being properly fedi tof theV comveyorthe stoplrne'chenism will be rendereda amdsmein# teined inactive. yHowever', in the absence of the enga-gement of the extremityl 29' 'otthe eler 128 -with the egeVK offenf envelope',- the wili be inmediately ren. Y

stopKV mechanism deivedy active and' the operation of; theme1- Any suitable means"megr be provided for pl'rcvlentiiig the*l extremity 29" of the-'fhiger feeler 28 fromdropp-ing to render the stop w the ingeror" feeler is pessingfrbnr one' en? velope to the other, sind. tofthet end there muy be' provided e collar or lslleinldel" ori'naitionf ,611 dn the yrecipgro'caftinig` `rodi shoulder or coller' is arranged: as" that es' the rod119 rissto'ciosethe closm'ei 1'5 it 'will eesnmef, e position -dfimeetlly vbene'ttlrand in close proXimity to the ingeior ieelerQS tos @Lippertv the `latter temporarily iintil the rod 19 returnsjqrislovveredzat'fwhilr time `the extremity 290i thiefy eeler QSJviill .drop upon the u'pper edge' of the lette-r is present therebeneeth ndin' thecon veyor 18. In the absence offanenfvelepe at this point `:mnd-v at thie Atime ilnythe cycle of operation of the machine, theiimger'or eelr 2S will dropr and: the stops meehaismf rwill renderedective. i 7" .f Anysuitabl meensmay be'prvxivided' for resetting the stop mechanism after it'hals beenirrice"epervifred:y Y

To thatfendtheremey be providedy a' rod 6% whichisf arrengedin an convenient plosi-I tio'n for the operator and which to move in suitable bearings 63.1"l To ltlfie fm1 werd-,end of the-.rod islconecte'd ain-operatingfhardle or button 64 and the'r'e'mf end thereerfI may be deflected" asiat 66. andfeeiil eeteill with e" inenibcrvf that ispivot'e'lly supported as; M617 .f A portion offtheinem-i ber 66 projects' laterally :xs-3F68 with respect to themember and vpa'ss'esbeneath a portion of the dog. 3-1- (see perticnlerlygFigI-rres @fend 6). Norma-Mythe portion (5B-ofthe kniern'zber 66 isin a positienvso as not to` interfere" the operation of the dog" 3-1', but is' positioned that it will form a stop'and support for thedog .B1-when the' latter; drops out of engegenient with theshou'lde'r ore'o'llanP 39;. After the stop mechaiisn has' been released andthe dogf 31 drops; the lever 53 andi/the member 33 will'be in what might beltermed o'rw'ardi positioned That isi the end 55 ofthe lever 53 will be' seated in the recess 56 in thex bracketA 57 and the member' 33 Willllbe'f in ai .pesitienfthat' the shoulder' or' eoiler thi'ere-L on will' bereaved fbrwerdly with respect,J to* the dg- 31'. 'Eo reset the mechanism it is envelope; I. if the;

is) invented A A Vimtil it assumes the to receive the end 5 5 of the lthe lever 53 the member 33 position shown in Figure 1 and also to move the lever 53 tothe position shown in Figure 1 after the member 46 has been retracted.

This may be accomplished by shifting the arm or lever 50 in the proper direction to first move the member 46 to the right in Figure 3 until the recess 48 is in a position lever 53. The spring 59 between the lever 53 and the member 33 will form the connecting means whereby upon the movement of the upper end of will be retracted ntil the shoulder 32 is in a position .to be engaged by the dog 31.

The dog 31 may then be'raised by rotation of the rod 62 through the medium of the handle or button 64 and which rotation will rock the member 66 to cause'the projecting portion 68 thereof to engage beneath the dog 31 and raise the latter. ,When the rod 62 is released the weight of the member 66 will cause the latter to drop out of engagement with the dog 31.

, It will therefore be seen that with this improved construction the stopping of the machine will be automatic when the enevelopes are not being properly fed or positioned at a predetermined time in the cycle of operation of the machine. r

It willalso be manifest that after the ma` chine has been once stopped or rendered inactive b y the stop mechanism, the parts may be readily adjusted by the operation of the lever 50 and the rod or member 62 to reset the stop mechanism.

Furthermore by the application of this stop mechanism to the machine the starting and stopping of the machine manually by the operation ofy the control lever 24 will not be interfered with.

At night or after the supply of envelopes for any particular run has been exhausted, it will be manifest that some of the envelopes will remain in the carrier 17-18. It will also be manifest that this condition will eX-` ist after the last envelope has passed out of engagement with the feeler or finger 25E- 29, as the machine will be automatically stopped when no envelope is in engagement with the finger. Under these conditions it would be desirable to continue the operation of the machine suiiiciently to run out"7 the envelopes that are held by the conveyor. Therefore, the operation of the 'machineshould be continued even though there is no envelope to engage the finger 28-29. This may be accomplished by manipulatingthe bar or rod 62 by the handle 64 so as to hold up the member 66 and the projecting portion 68 thereon in engagement with the dog 31 to prevent the latter from dropping and thereby maintain the member 33 retracted or locked against movement under the stress of the spring 38, with the result that the controlling clutch of e the machine will not be operated and the machine will then continue to operate until the member 66 is allowed to fall, at the will of the operator, to release the dog 31 so that it will function to release the member 33.

While the preferred form of the invention has beenherein shown and described, it is to be understood that various changes may be made in the details of construction and in the combination and arrangement of the several parts, within the scope of the claims, without departing from the spirit of this invention. Y

What is claimed as new is 1. Ina machine of the character described, means for causing the article being operated upon to assume ya predetermined position in the cycle of operation of the machine, clutch mechanism for controlling the 'operation of the machine, means tending normally to renlder said clutch mechanism inactive, means embodying a locking device forV rendering and maintaining the last said means inactive during the normal operation of the machine,

the last recited meansembodying an element to be engaged by the article, the said element operating in the absence of the articleto cause the said means under the controlof the operator for maintaining the said locking device active in the absence of an article in co-operation with said element.

2. An envelope making machine embodying a controlling clutch, a conveyor for receiving and conveying the articles, means tending normally to render said clutch'inactive, a locking device for maintaining the last said means inactive, a feeler member adapted to be engaged and shifted by the articles in the conveyor, means responsive to the movement of said feeler member in the absence of an article upon the conveyor for rendering said locking device inactive, and means under control of the operator for maintaining said locking means active in the absence of an article in the conveyor.

3. A machinehaving a deiinite cycle of operation, a clutch for controlling such operation, a feeler member adapted to be engaged and shifted in one direction by the articles handled by the machine, means tending normally to render said clutch inactive, a locking device for maintaining the last said means inactive, means whereby in the absence of an article at a predetermined station in the cycle of operation of the machine, the said feeler member willcause the said locking device to become inactive to cause the iirst recited means to become active, and means for maintaining said clutch active at will in the absence of an article at said predetermined station.

4. A machine having a definite cycle of operation, a clutch for controlling such operation, a conveyor for advancing the articles locking device to become inactive, and

eration ofthe vfeeler member.

7. A machinehaving a definite cycle @fop-'x eration, a clutch controlling such Qperation, Va conveyor for advancing :the articles operated upon, means embodying a shiftable' render the clutch inactive, means embodying a counterbalanced'iocking dog for maintainf ing `thewlast Asaid means inactive, a .feelen member engaged-and lifted by the articles as they are advanced, means whereby in the-ab sence of an articleengagng'ffsaid feeler membertlie-feeler vmember `will drop and therebyn cause -the said'locking dog't'o becomeoverbalanced and shifted to an' inactive position to'reeasefthe second :recited Imeansfandmeans under the control of the operator ferfcon-"f ber.- t Y 8. vA machine having a ,definite ycycle of opi,

tnolli'ngthe operation of said feeler member.

5. A vmachine having a definite cycle ofopfv eration, a clutch `for controlling such operaopejrated zupon, means tending normally to render the lclutch inactive, vmeans embodying a counterbalanced locking dog for maintaining the-last said means inactive, a feelery member' `engaged and liftedbythe articles as they are 1advancedmeans operatinor automatically at a predetermined time inthe cycle of Ao eration 'of the machine to relieve the bindingactionbetween the co-operating parts of the second recitedmeans, means 'whereby in Ithe :absence `of an article engaging said Y feeler member the feeler member will ydrop and exert its weight upon the said locking dogto overbalance the r same and cause it to be Y' shifted to .an inactive position to release lthe i second recited means, and means under the control of the operator for controlling the operation of said feeler'member.

'6. A smachine `'having a definite cycle of` operation, a vclutch controlling such operation, a conveyor for `advancing the articlesl embodying ,a Shfmble member means ten (1 operated upon, means embodying a-shiftable f member for rendering the clutch inactive,

' means tending normally to move said member in one directioma shoulder on said member,

v a dog engaging saidl shoulder "for locking 4the said member against the stress of the last said means, a feeler member adaptedto beengaged andshifted inone direction by the advancing articles and to automatically move in the -oppesitejdirection in the 1absence of' any-article m Y 'engagement therewlth "mterengagmg Vtime inthe cycle of .operation .of the Amachine =l means :forming a; connection between said I0 feeler memberand said dog whereby the last' member for rendering the clutch inactive,

means-tending-normallyto lmove' said member in one'direction, a'shou'lder on said member, a dog engaging f said 'shoulder Efor 'locking the saidmember against thestress offthellast saidV means, a f feelei"` member adaptedfto be engaged and shifted in one direction by -the advancing 'articlesI and te automatically Y :move

inthe opposite direction inthe absence of any article in engagement therewith, :means Y operable at a predetermined time inthe cycle of operation of rthe machine fory shiftingthe said member against thestress of thesecond K' said nieans,aiid means whereby the l'last said eration, a clutch controlling such operation,

a conveyorior advancingthe articles opert1on,a conveyor for advancing the articles ated upon, means embodying a' shiftable memi, berlg'or rendering the clutchV inactive, means, tending normally to mfove said menib in one direction, a shoulder on said member, Va dog engtglhl SdShOulder for locking'thea member against `the stress 1 .of fthe :Last Said means, ,a eeler member `adapted@ bengd een and shifted in one directen bythe savana] ing-articles and to automatiil'lly 111mml in the opposite direction inthe absence of anyfiarticle in engagement therewith,means,movable v means whereby the last said movementeftlie the 'articles which engage ythe lattelgand saidfeeler member will operate to/,movethe dog out yof engagement with said shoulder-te release the said member.

9. A Amachine'having a definitecycle 0px eration, means for controllingsuch riparati-on ing normally to move said member;inonejidiF Yrection,a feeler member to-be engaged and engaging mans baweenithaii ai,ft-atieA and feeler members Afor'maintaining the Said' shi'ftable Vmember against movement by, the

first said means, the saidinterengaging-means beingk rendered inactiiie by fthe; movement of J the Veeler member in one direotiomzand means automatically operating at `a predetermined for impartngamovement `to the vsaid sh-iftable'member against thelstress offthe first said 'l means to relieve a'bindin the said interengaging means.

10.- A machine `having a :definite cycle of operationmeans for controlling suchoperation `:embodying a shiftable member, means g action between tending normally lto move '1said`-member one direction, a'feeler member -to 'be engaged y and shifted by the art-'iclesin the machine, in-

terengaging means between thesaid shi'ftable and feeler members `formaintainingthesaid shiftable member Aagainst `movemeiitby' the first said means, thesa'id interengaging'ineans being rendered' inactive by 'the movement off 'Y l the feeler'member'in oneidirection, andn means operable at the will of the operatorV for renv dering said interengaging means active.

11. A machine having a definite cycle of operation, means for controlling such operation embodying a shiftable member, means tending normally to move said member in one direction, a feeler member to be engaged and shifted by the articles in the machine, interengaging means between the said shiftable and feeler members for maintaining the said lmeans for rendering said interengaging means active at will. Y

12. A machine having a definite cycle of operation, means for controlling such operation, said means embodying a shiftable member, means tending normally to move said member in one direction, a shoulder on said member, a dog engaging said shoulder for maintaining said member against movement `by the second recited means, a feeler member adapted to be enga-ged and shifted in one direction by the articles in the machine, means operatively connecting said Vfeeler member and said dog whereby the latter will be moved out of engagement with said shoulder in the absence of an article engaging said feeler member, and means for relieving the binding action between said dog and f shoulder to permit the dog to be shifted by the feeler member. Y

13. A machine having a `definite cycle of operation, means for controlling such operation, said means embodying a shiftable member, means tending normally to move said member in one direction, a shoulder on said member, a dog engaging saidvshoulder for maintaining said member against movement by the second recited means, a feeler membery adapted to be `engaged and shifted in one direction by the articles in the machine, means operatively connecting said feeler member and said dog whereby the latter will be moved out of engagement with said shoulder in the absence of an article engaging said feeler member, means for relieving the binding action between said dog and shoulder to permit the dog to be shifted by the feeler member, and means for moving the dog to a position to be engaged by said shoulder.

14. A machine having a definite cycle of operation, means for controlling such operation, said means embodying a shiftable member, means tending normally to move said member in one direction, a shoulder on said member, a dog engaging said shoulder for maintaining said member against movement by the second recited means, a feeler mem-Y ber adapted to be engaged and shifted in one direction by the articles in the machine, means operatively connecting said feeler member and said dog whereby the latter will be moved out of engagement with said shoulder in the absence of an article engaging said feeler member, and intermittently operating cam mechanism for moving said shiftable member ragainst the Vstress of the second recited means.

15. A machine having a definite Vcycle ofy operation, means for controlling such operation and embodying a shiftable member, means tending normally to move said member in one direction, a shoulder on said member, a dog adapted to engagesaid shoulder to loclr said member against movement under the stress of the second said means, a feeler member adapted to be` engaged and shifted in one direction by the articles in the machine, and an operative connection between said feeler member and said dogv whereby in the absence of the engagement of the feeler member by an article the feeler member will drop and its weightfwill be applied to shift the dog out of engagement with said shoulder to release the shiftable member, said connectionoperating to permit the feeler member to move independently of the said dog.

16. A machine having a definite cycle of operation, means for controlling such operation and embodying a shiftable member, means tending normally to move said member in one direction, a shoulder on said member, a dog adapted to `engage said shoulder to lock said member against movement under the stress of the second said means, a feeler member adapted to be engaged and shifted in one direction by the article s in the machine, and an operative connection between said feeler member and said dog, said c connection embodying a slot in 'one ofy the parts and a pin on the other part freely movable in the slot, whereby said feeler member will -be adapted for` an independent movement with respect Ito the dog and in the absence of an article in engagement with the Vfeeler member, the latter will drop-and its v weight will be utilized to move the dog out of engagement with said shoulder to release the first said member.V j

17. A machine having a Vdefinite 'cycle' of operation, means for controlling such operation and embodying a shiftable member, means tending normally to movel said member in one direction, a shoulder on said member, a dog adapted to lengage said shoulder to lock said member against movement under the stress of the second said means, a feeler member adapted to be engaged and shifted in one direction by the articles in the machine, an operative connection between said eeler member and said dog, said connection embodying a slot in one of the parts and a pin on the other part freely movable in the slot, whereby said feeler member will be adapted for an independent movement with respect to the dog and in the absence of an article in engagement with the feeler member, the latter will drop and its weight will be utilized to move the dog out of engagement with said shoulder to release .the first said member, and means for temporarily relieving the binding action between said doO and said shoulder. 18. A machine having a definite cycle of operation, means for stopping such operan tion including a feelermember adapted to be engaged by the articles in the machine, v lsaid feeler member in the absence of an ar ticle in engagement therewith being adapted to move in a direction to render the said stopping means active, and means operating intermittently to maintain said eeler member against the last said movement while the article engaging portion thereof is out of engagement with an article during a normal operating condition of the machine.

19. A machine having a definite cycle of operation, means for stopping such operation including a feeler member adapted to be en aged by the articles in the machine, said eeler member in theabsence of an article in engagement therewith being adapted to drop to render the said stopping means active, and means operating intermittently toV maintain said feeler member against such dropping during the interval between the engagement ofsuccessive articles therewith during the normal operation of the machine.

20.!:111 a machine of the character described, a conveyor for conveyingthe articles toa definite station therein, means controlled by the articles for maintainin the machine in operation, the said means ei'ng automatically operable in the absence of an article at said station for stopping the operation of the machine, and means under control of the operator for maintaining the first said means against operation whereby vthe machine will continue in its operation in the 5g absence of an article at said station.

In testimony whereof I have signed my name to this specification, on this 18th dayV of August, A. D. 1928.

WALTER ALLAN DUSENBURY. 

